This is a note to let you know that I've just added the patch titled
iio: adc: xilinx: Fix VREFN sign
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-adc-xilinx-fix-vrefn-sign.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 Mon Sep 17 00:00:00 2001
From: Thomas Betker <thomas.betker@xxxxxxxxxxxxxxxxx>
Date: Wed, 15 Apr 2015 21:11:50 +0200
Subject: iio: adc: xilinx: Fix VREFN sign
From: Thomas Betker <thomas.betker@xxxxxxxxxxxxxxxxx>
commit 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 upstream.
The VREFN channel is bipolar, not unipolar. Small negative values do
occur (e.g., -1mV), and unsigned conversion maps them incorrectly to
large positive values (about +1V), so fix this.
Signed-off-by: Thomas Betker <thomas.betker@xxxxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/xilinx-xadc-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -997,7 +997,7 @@ static const struct iio_event_spec xadc_
.num_event_specs = (_alarm) ? ARRAY_SIZE(xadc_voltage_events) : 0, \
.scan_index = (_scan_index), \
.scan_type = { \
- .sign = 'u', \
+ .sign = ((_addr) == XADC_REG_VREFN) ? 's' : 'u', \
.realbits = 12, \
.storagebits = 16, \
.shift = 4, \
Patches currently in stable-queue which might be from thomas.betker@xxxxxxxxxxxxxxxxx are
queue-4.0/iio-adc-xilinx-fix-register-addresses.patch
queue-4.0/iio-adc-xilinx-fix-vccaux-channel-.address.patch
queue-4.0/iio-adc-xilinx-fix-vrefp-scale.patch
queue-4.0/iio-adc-xilinx-fix-vrefn-sign.patch
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